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Features

Radioactivity

Advances in a Theory That Has Enabled Us to Study Natural Transmutation

Liquid Trade Wastes

A Difficult Problem in River Polution

Collections of the New York Aquarium

A Famous Institution Known to Naturalists and Sportsmen Throughout the World

By R. W. Slmfeldt

Catalytic Agents

Their Relation to Modern Methods

Red Color of Faint Stars

The Nature of Ball Lightning

A Curious Phenomenon, and Attempts to Explain Its Nature and Action

By Karl Wolf

Ammonia a Heat Vehicle

A Popular Explanation of the Refrigerating Process

By Albert Johnson

Reproducing Prehistoric Monuments

Valuable and Clever Archæological Work at Quirigua, Guatemala

By Neil M. Judd

Good Water for Homes

Future Methods of Utilizing Coal

Economic Problems That Are Beginning to Attract Attention

By C. F. Hirshfield

Formulas for Glass Manufacture

Railway Exhibits at the Panama-Pacific Exposition

Details and Construction of the Steam and Electric Locomotives

By H. J. Kennedy

Recent Progress in Astrophysics—II

Many Important Discoveries That Add to Our Knowledge of the Heavenly Bodies

By C. G. Abbot

Duff or Dust in Coal

New Books, Etc.

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    July 24, 1915

    Think Outside the Gift Box